1.\" Copyright (c) 1996-1999 Whistle Communications, Inc. 2.\" All rights reserved. 3.\" 4.\" Subject to the following obligations and disclaimer of warranty, use and 5.\" redistribution of this software, in source or object code forms, with or 6.\" without modifications are expressly permitted by Whistle Communications; 7.\" provided, however, that: 8.\" 1. Any and all reproductions of the source or object code must include the 9.\" copyright notice above and the following disclaimer of warranties; and 10.\" 2. No rights are granted, in any manner or form, to use Whistle 11.\" Communications, Inc. trademarks, including the mark "WHISTLE 12.\" COMMUNICATIONS" on advertising, endorsements, or otherwise except as 13.\" such appears in the above copyright notice or in the software. 14.\" 15.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 16.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 17.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 18.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 19.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 20.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 21.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 22.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 23.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 24.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 25.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 26.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 27.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 28.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30.\" THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 31.\" OF SUCH DAMAGE. 32.\" 33.\" Author: Archie Cobbs <archie@FreeBSD.org> 34.\" 35.\" $FreeBSD$ 36.\" $Whistle: ng_hole.8,v 1.4 1999/01/25 23:46:26 archie Exp $ 37.\" 38.Dd May 19, 2004 39.Dt NG_HOLE 4 40.Os 41.Sh NAME 42.Nm ng_hole 43.Nd netgraph discard node type 44.Sh SYNOPSIS 45.In netgraph/ng_hole.h 46.Sh DESCRIPTION 47The 48.Nm hole 49node type silently discards all data and control messages it receives. 50This type is used for testing and debugging. 51.Sh HOOKS 52A 53.Nm 54node accepts any request to connect, regardless of the hook name, 55as long as the name is unique. 56.Sh CONTROL MESSAGES 57This node type supports the generic control messages, plus the 58following: 59.Bl -tag -width indent 60.It Dv NGM_BPF_GET_STATS 61This command takes an 62.Tn ASCII 63string argument, the hook name, and returns the statistics 64associated with the hook as a 65.Vt "struct ng_hole_hookstat" . 66.It Dv NGM_BPF_CLR_STATS 67This command takes an 68.Tn ASCII 69string argument, the hook name, and clears the statistics 70associated with the hook. 71.It Dv NGM_BPF_GETCLR_STATS 72This command is identical to 73.Dv NGM_BPF_GET_STATS , 74except that the statistics are also atomically cleared. 75.El 76.Sh SHUTDOWN 77This node shuts down upon receipt of a 78.Dv NGM_SHUTDOWN 79control message, or when all hooks have been disconnected. 80.Sh SEE ALSO 81.Xr netgraph 4 , 82.Xr ng_echo 4 , 83.Xr ngctl 8 84.Sh HISTORY 85The 86.Nm 87node type was implemented in 88.Fx 4.0 . 89.Sh AUTHORS 90.An Julian Elischer Aq julian@FreeBSD.org 91